import numpy as np

arr = np.array([[1, 2, 3], [4, 5, 6], [7, 8, 9], [10, 11, 12]])
print('4*3的整数数组: \n', arr)
print('数组的ndim属性: ', arr.ndim)
print('数组的shape属性: ', arr.shape)
print('数组的size属性: ',arr.size)
print('数组的dtype属性: ', arr.dtype)